# Re: [R] scatterplot3d + density() + polygon(color)

From: Romain Francois <francoisromain_at_free.fr>
Date: Wed 28 Sep 2005 - 18:22:15 EST

Le 28.09.2005 09:45, Martin Maechler a écrit :

>>>>>>"UweL" == Uwe Ligges <ligges@statistik.uni-dortmund.de>
>>>>>> on Wed, 28 Sep 2005 08:58:16 +0200 writes:
>>>>>>
>>>>>>
>
> UweL> klebyn wrote:
> >> Hi R Users,
> >>
> >> How to use the function polygon() together with the
> >> package scatterplot3d?
> >>
> >> I am trying to color below of the curves defined for the
> >> function density().
> >>
> >> I tried to use the site: R GRAPH GALLERY as tutorial.
> >>
> >>
> >> [code]:
> >>
> >> to my case but I do not obtain success.
> >>
> >> Somebody could give a tip to me, please?
> >>
> >> I am thankful anticipatedly.
> >>
> >> Cleber Borges
> >>
> >>
> >>
> >> #My code test
> >> ##############
> >> ...................
>
> UweL> Example:
>
>
>
>>> library(scatterplot3d)
>>>
>>> x <- c(0.4, -1.2, .8, -.7, 0)
>>> d <- vector(length = length(x), mode = "list")
>>> d[] <- density(x, bw = 1.2, from = -3.0, to = 3.0)
>>> d[] <- density(x, bw = 0.8, from = -3.0, to = 3.0)
>>> d[] <- density(x, bw = 0.6, from = -2.5, to = 2.5)
>>> d[] <- density(x, bw = 0.5, from = -2.0, to = 2.0)
>>> d[] <- density(x, bw = 0.3, from = -1.5, to = 1.5)
>>>
>>> x <- lapply(d, "[[", "x")
>>> y <- lapply(d, "[[", "y")
>>> z <- lapply(seq(0.1, 0.5, 0.1), rep, each = 512)
>>>
>>> sx <- unlist(x)
>>> sy <- unlist(y)
>>> sz <- unlist(z)
>>>
>>> s3d <- scatterplot3d(x = sx, y = sz, z = sy, type = "n")
>>> for(i in rev(seq(along=d))){
>>> s3d_coords <- s3d\$xyz.convert(x[[i]], z[[i]], y[[i]])
>>> polygon(s3d_coords, col = i, border = "black")
>>> }
>>>
>>>
>>>
>
>Very nice, Uwe!
>
>To make it "perfect", you'd have to add
>
> s3d\$box3d()
>
>at the end; otherwise some of the painted polygons hide lines of
>the cube box which should not be hidden.
>
>Martin Maechler
>
>
Very nice indeed,

may i suggest some changes in the lapply calls :

```     x <- lapply(d, function(dd){dd\$x[c(1,1:512,512)]})
y <- lapply(d, function(dd){c(0,dd\$y,0)})
z <- lapply(seq(0.1, 0.5, 0.1), rep, each = 514)

```

some densities weren't 0 at the end of the interval, so the curves seemed rotated. especially the red one.

Romain

```--
visit the R Graph Gallery : http://addictedtor.free.fr/graphiques
~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~
~~~~~~      Romain FRANCOIS - http://addictedtor.free.fr         ~~~~~~
~~~~        Etudiant  ISUP - CS3 - Industrie et Services           ~~~~
~~                http://www.isup.cicrp.jussieu.fr/                  ~~
~~~~           Stagiaire INRIA Futurs - Equipe SELECT              ~~~~
~~~~~~   http://www.inria.fr/recherche/equipes/select.fr.html    ~~~~~~
~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~

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